chore: remove maintainer (#6246)

Signed-off-by: yukke42 <yusuke.muramatsu@tier4.jp>

Author: yukke42

common/object_recognition_utils/package.xml

@@ -6,7 +6,6 @@
   <description>The object_recognition_utils package</description>
   <maintainer email="takayuki.murooka@tier4.jp">Takayuki Murooka</maintainer>
   <maintainer email="satoshi.tanaka@tier4.jp">Satoshi Tanaka</maintainer>
-  <maintainer email="yusuke.muramatsu@tier4.jp">Yusuke Muramatsu</maintainer>
   <maintainer email="shunsuke.miura@tier4.jp">Shunsuke Miura</maintainer>
   <maintainer email="yoshi.ri@tier4.jp">Yoshi Ri</maintainer>
   <license>Apache License 2.0</license>

common/perception_utils/package.xml

@@ -5,7 +5,6 @@
   <version>0.1.0</version>
   <description>The perception_utils package</description>
   <maintainer email="satoshi.tanaka@tier4.jp">Satoshi Tanaka</maintainer>
-  <maintainer email="yusuke.muramatsu@tier4.jp">Yusuke Muramatsu</maintainer>
   <maintainer email="shunsuke.miura@tier4.jp">Shunsuke Miura</maintainer>
   <maintainer email="yoshi.ri@tier4.jp">Yoshi Ri</maintainer>
   <license>Apache License 2.0</license>